Coverage Map

Hi… I need to create a coverage map where potential clients can go to and add their address to see if we have them covered. An example of one, not in WordPress, can be viewed here:
https://portal.home-connect.co.za/#/checkcoverage
There are many other examples but this is just one. I need to know is there a plugin that can do this or an external site that offers this or is it going to take a lot of dev to get this done. Thank you for your assistance in advance